INGREDIENTS
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Nonstick vegetable cooking spray, for pans
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2 tablespoons unsweetened cocoa powder, plus more for dusting
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5 cups cake flour (not self-rising)
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2 teaspoons kosher salt
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3 cups sugar
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3 cups canola oil
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4 large eggs
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4 tablespoons red food coloring (one 2-ounce bottle)
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2 teaspoons pure vanilla extract
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2 cups well-shaken buttermilk
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1 tablespoon baking soda
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5 teaspoons distilled white vinegar
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Three 8-ounce packages cream cheese, softened
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5 cups sifted confectioners’ sugar
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1 1/2 cups unsalted butter, softened
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1 1/2 teaspoons vanilla extract